1 files changed, 27 insertions, 0 deletions
diff --git a/test/CodeGen/R600/dot4-folding.ll b/test/CodeGen/R600/dot4-folding.ll
new file mode 100644
index 000000000000..3e8330f9b3ed
--- /dev/null
+++ b/test/CodeGen/R600/dot4-folding.ll
@@ -0,0 +1,27 @@
+;RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s
+
+; Exactly one constant vector can be folded into dot4, which means exactly
+; 4 MOV instructions
+; CHECK: @main
+; CHECK: MOV
+; CHECK: MOV
+; CHECK: MOV
+; CHECK: MOV
+; CHECK-NOT: MOV
+; CHECK-NOT: MOV
+; CHECK-NOT: MOV
+; CHECK-NOT: MOV
+
+define void @main(float addrspace(1)* %out) {
+main_body:
+  %0 = load <4 x float> addrspace(8)* null
+  %1 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 1)
+  %2 = call float @llvm.AMDGPU.dp4(<4 x float> %0,<4 x float> %1)
+  %3 = insertelement <4 x float> undef, float %2, i32 0
+  call void @llvm.R600.store.swizzle(<4 x float> %3, i32 0, i32 0)
+  ret void
+}
+
+declare float @llvm.AMDGPU.dp4(<4 x float>, <4 x float>) #1
+declare void @llvm.R600.store.swizzle(<4 x float>, i32, i32)
+attributes #1 = { readnone }